{
  "manageEntity": {
    "action": "Save",
    "entityId": "657123861",
    "entityType": "Track",
    "nonce": "0xb7720af6321715a2b8c3ebc1584cad35d27faf40748e22c684ba72fc560142c9",
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    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}